Direct observation of intrinsic twin domains in tetragonal CH₃NH₃PbI₃.

ABSTRACT: Organic-inorganic hybrid perovskites are exciting candidates for next-generation solar cells, with CH₃NH₃PbI₃ being one of the most widely studied. While there have been intense efforts to fabricate and optimize photovoltaic devices using CH₃NH₃PbI₃, critical questions remain regarding the crystal structure that governs its unique properties of the hybrid perovskite material. Here we report unambiguous evidence for crystallographic twin domains in tetragonal CH₃NH₃PbI₃, observed using low-dose transmission electron microscopy and selected area electron diffraction. The domains are around 100-300 nm wide, which disappear/reappear above/below the tetragonal-to-cubic phase transition temperature

SUBMITTER: Rothmann MU 

PROVIDER: S-EPMC5331338 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature